ive been thinking about it and i dont think it would be pratical anyway. the engine is not designed to pull that amount of weight and under those conditions.
Yep.... that's why they're so slow and unreliable..........
At the risk of repeating myself......... as stated before they have more power and torque that the original engines that were designed to pull that amount of weight. The gearing is adapted so that helps massively with the strain on the engine.
but if you'd rather spend the money tuning an a-series then fair enough that's your choice and entitlement

I'll just leave with a single quote.....
"you can polish a turd all day long, but it'll still be a turd"
Joking!! Before I get strung up